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vibration-sensor-module-71e849-en.md

Impact Detection: The Vibration Sensor

The Vibration Sensor (specifically the SW-420 or similar piezoelectric modules) is the core component of car alarms, washing machine balancers, and smart security systems. It detects physical shock and vibration that tilt sensors might miss.

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The Mechanics of Shock

Inside the SW-420 module is a small metal rod and a spring mechanism (or a piezo crystal).

  • At Rest: The circuit is open; the sensor outputs a digital LOW.
  • During Impact: Vibration causes the internal elements to touch rapidly, creating a series of digital HIGH pulses.
  • The Amplifier: An onboard LM393 comparator chip cleans up these messy signals and sends a clean digital trigger to the Arduino.

Components Needed

  • Arduino Uno/Nano: To monitor the digital pin.
  • SW-420 Vibration Sensor Module: The impact detector.
  • LED and Buzzer: To provide instant feedback.
  • Potentiometer (on the module): To dial in the exact sensitivity required.

Typical Uses

You can attach this sensor to a window pane to detect if the glass is being broken, or to a desk drawer to act as a tamper alarm. It's a highly responsive sensor that adds a robust layer of physical security to any project.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Vibration Sensor Module"
description: "Detect knocks and impacts! Use the SW-420 vibration sensor to trigger an alarm or log movement when a door or object is struck."
category: "Security"
difficulty: "Easy"